US 12,083,602 B2
Preparation method of titanium alloy powders
Yi Xu, Chengdu (CN); Chengyang Zhang, Chengdu (CN); Siyi He, Chengdu (CN); and Hui Chen, Chengdu (CN)
Assigned to SOUTHWEST JIAOTONG UNIVERSITY, Chengdu (CN)
Filed by SOUTHWEST JIAOTONG UNIVERSITY, Chengdu (CN)
Filed on Apr. 9, 2024, as Appl. No. 18/630,802.
Application 18/630,802 is a continuation of application No. PCT/CN2022/122964, filed on Sep. 30, 2022.
Claims priority of application No. 202111374069.7 (CN), filed on Nov. 19, 2021.
Prior Publication US 2024/0253122 A1, Aug. 1, 2024
Int. Cl. B22F 9/14 (2006.01); C22C 1/02 (2006.01); C22C 14/00 (2006.01); C22F 1/18 (2006.01)
CPC B22F 9/14 (2013.01) [C22C 1/02 (2013.01); C22C 14/00 (2013.01); C22F 1/183 (2013.01); B22F 2202/13 (2013.01); B22F 2301/205 (2013.01); B22F 2998/10 (2013.01); B22F 2999/00 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A preparation method of titanium alloy powders, comprising the following steps:
mixing alloying elements according to alloy element ratios of: 0.1 wt % to 1.0 wt % Y, 5.5 wt % to 6.8 wt % Al, 3.5 wt % to 4.5 wt % V, and Ti as balance, preparing alloy ingots by a vacuum smelting process, and performing a forging and rolling process for the alloy ingots to obtain forged and rolled alloy ingots, where, a temperature of the forging and rolling process is 800° C. to 1100° C., the forging and rolling process lasts for 80 min to 140 min, and a deformation degree of the alloy ingots during the forging and rolling process is 30% to 50%;
performing a mechanical treatment for the forged and rolled alloy ingots, to obtain alloy rods that meet a size requirement of a plasma rotating electrode process;
preparing titanium alloy powders based on the alloy rods by the plasma rotating electrode process;
where the step of preparing titanium alloy powders based on the alloy rods by the plasma rotating electrode process comprises:
loading the alloy rods into a rotatable feeding device, vacuuming an atomization chamber until a vacuum degree of the atomization chamber reaches 1×10−3 Pa to 1×10−2 Pa, and filling an inert gas into the atomization chamber until a pressure of the atomization chamber reaches 1.6×105 Pa to 1.8×105 Pa, and keeping an oxygen content of the atomization chamber at a level not greater than 100 ppm;
starting a cooling system to control a temperature of the inert gas within 200° C. to 400° C.;
starting the rotatable feeding device and a power supply of a plasma gun to perform an atomizing process and to obtain the titanium alloy powders, where a plasma arc is generated between the alloy rods and the plasma gun, and under a combined action of a centrifugal force and a surface tension, the alloy rods are melted and changed into droplets, and the droplets are solidified into the titanium alloy powders;
after the titanium alloy powders completely cool down, the titanium alloy powders are vacuum packaged and stored;
preparing parameters are: a rotating speed of the alloy rods is 25000 r/min to 35000 r/min, a feeding speed of the alloy rods is 1.0 mm/s to 2.0 mm/s, a power of the plasma gun is 60 kw to 140 kw, the inert gas serves as a protective gas during a powder making process, a spindle current of the plasma rotating electrode of the rotating feed device is 600 A to 800 A, and a working current of the plasma gun is 80 A to 120 A.